#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>

int main()
{
    printf("I'm a progress, pid: %d; ppid: %d\n", getpid(), getppid());

    pid_t id = fork();

    if(id == 0)
    {
        while(1)
        {
            printf("I'm child, pid : %d; ppid: %d\n", getpid(), getppid());
            sleep(1);
        }
    }
    else if(id > 0)
    {
        while(1)
        {
            printf("I'm father, pid : %d; ppid: %d\n", getpid(), getppid());
            sleep(1);
        }
    }
    else
    {
        printf("error\n");
    }

    return 0;
}

